Joint member manufactured using pipe and manufacturing method of the same

ABSTRACT

A method for manufacturing a joint member, which includes a retaining portion formed by pressing a stainless steel pipe that is cut into a predetermined length, a joining portion having a spiral portion or a spiral groove, and an insert member made of synthetic resin and being pressed into the pipe so that a packing and a compression ring can be located in a proper position. The joint member using a pipe includes: a metal member having a retaining portion formed by pressing a stainless steel pipe cut into a predetermined length and a joining portion formed on the stainless steel pipe; and an insert member made of synthetic resin, the insert member being pressed to the retaining portion and mounted on the inner circumference of the metal member to locate joint means in a proper position.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a joint member manufactured using apipe and a manufacturing method of the same, and more particularly, to ajoint member that is manufactured using a stainless steel pipe invarious forms by pressing work and insert press-in work without needinga hazard inspection due to lead hazards.

2. Background Art

In general, a joint member for corrugated pipes or straight pipes has aspiral portion formed on the outer circumferential surface thereof or aspiral groove formed on a through hole, and the through hole has astepped jaw or an inclined jaw portion, to which joint means having apacking and a compression ring can be mounted in a proper position.

Moreover, a member that has a spiral groove formed on the innercircumference of a pipe is used at a connection portion of the jointmember, which is welded integrally with various tools, and, to which thecorrugated pipe or the straight pipe is connected. However, because themember does not have the stepped jaw or the inclined jaw portion and thejoint means including the packing and the compression ring cannot bemounted thereon, the joint member is additionally joined to theconnection portion, and then, the corrugated pipe or the straight pipeis connected to the joint member.

Typically, such a joint member is manufactured of brass casting, butrecently, tends to be manufactured of stainless material due tocontroversy of lead hazards.

However, in case that the stainless material, which does not cause thecontroversy of lead hazards, in order to form the stepped jaw or theinclined jaw portion on the through hole, the joint member must bemanufactured through a precise casting method, but it causes an increaseof manufacturing costs and a productivity loss. Accordingly,manufacturers, who work in the art, are in dilemma.

SUMMARY OF THE INVENTION

Accordingly, the present invention has been made to solve theabove-mentioned problems occurring in the prior arts, and it is anobject of the present invention to provide a joint member, whichincludes a retaining portion formed by pressing a stainless steel pipethat is cut into a predetermined length, a joining portion having aspiral portion or a spiral groove, and an insert member made ofsynthetic resin and being pressed into the pipe so that a packing and acompression ring can be located in a proper position.

In the present invention, the joint member may be a bolt or a nut, whichis a component of joint means used for connecting a corrugated pipe or astraight pipe, or a connection portion that is welded integrally to amachine, such as a distributor for a boiler, to which the corrugatedpipe or the straight pipe is connected.

To accomplish the above object, according to the present invention,there is provided a joint member including: a metal member having aretaining portion formed by pressing a stainless steel pipe cut into apredetermined length and a joining portion formed on the stainless steelpipe; and an insert member made of synthetic resin, the insert memberbeing pressed to the retaining portion and mounted on the innercircumference of the metal member to locate joint means in a properposition.

Moreover, a nut portion is formed on the outer circumference of themetal member, which is the stainless steel pipe, by pressing work, sothat a corrugated pipe or a straight pipe can be joined easily.

In another aspect of the present invention, there is provided a methodof manufacturing a joint member using a pipe including: a press-moldingprocess of manufacturing a metal member of half-finished goods bypressing a stainless steel pipe, which is cut into a predeterminedlength, to form a retaining portion; a screw forming process of forminga joining portion on the metal member of the half-finished goods; and aninsert press-in process of pressing an insert member, which is made ofsynthetic resin material, to the retaining portion.

Furthermore, the press-molding process includes a first press-moldingprocess of molding the retaining portion (11); and a secondpress-molding process of molding a nut portion (13) on the outercircumference of the pipe.

As described above, the present invention can manufacture joint membersfor various use purposes using a stainless steel pipe only by pressingwork and insert press-in work, whereby joint members, which can calm thecontroversy of lead hazards, can be effectively manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the presentinvention will be apparent from the following detailed description ofthe preferred embodiments of the invention in conjunction with theaccompanying drawings, in which:

FIGS. 1 a, 1 b and 1 c are views showing a manufacturing process of ajoint member according to the present invention;

FIG. 2 is a perspective view showing an example that the joint memberaccording to the present invention is mounted on connection portions(see FIG. 1 a) of various machines;

FIG. 3 is a sectional view of FIG. 2;

FIG. 4 is a perspective view showing an example that the joint memberaccording to the present invention is a nut (see FIG. 1 b);

FIG. 5 is a sectional view of FIG. 4;

FIG. 6 is a perspective view showing an example that the joint memberaccording to the present invention is a bolt (see FIG. 1 c);

FIGS. 7 a and 7 b are sectional views showing examples of a joiningportion of FIGS. 6; and

FIG. 8 is a perspective view, in a partial section, showing a statewhere a corrugated pipe is connected using the joint member according tothe present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Reference will be now made in detail to the preferred embodiment of thepresent invention with reference to the attached drawings.

FIGS. 1 a, 1 b and 1 c are views showing a manufacturing process of ajoint member according to the present invention. As shown in thedrawings, the manufacturing process of the joint member according to thepresent invention includes: a press-molding process of manufacturing ametal member 10 of half-finished goods by pressing a stainless steelpipe, which is cut into a predetermined length, to form a retainingportion 11; a screw forming process of forming a joining portion 12 onthe metal member 10 of the half-finished goods; and an insert press-inprocess of pressing an insert member 20, which is made of syntheticresin material, to the retaining portion 11.

FIG. 1 a illustrates a state where a connection portion weldedintegrally to a machine, such as a distributor 30, is manufactured asthe joint member of the present invention.

Referring to FIGS. 1 b and 1 c, the press-molding process includes afirst press-molding process of molding the retaining portion 11, 111;and a second press-molding process of molding a nut portion 13, 131formed on the outer circumference of the pipe. In the drawings, thejoint member according to the present invention is manufactured as a nutor a bolt for a connection device having the nut portion 13, 131 on theouter face thereof.

Molds 41 and 42 that are used for the press-molding process may be awell-known press device having a shape corresponding to the shape of themetal member 10, 100, 1000 to be manufactured.

A mold 42 that is used for the second press-molding process may be apress device that includes at least two split stretchers 43 forming ahexagonal shape and being located inside the press device and a press-intool 44 for extruding out while the stretchers 43 goes down.

FIGS. 2 and 3 illustrate an example that the connection portion weldedintegrally to the machine, such as the distributor 30, is manufacturedas the joint member according to the present invention. Because theretaining portion 11 is welded integrally to the distributor 30, theconnection portion serves as the joint member, on which a packing 31 anda compression ring 32 can be mounted by the insert member 20, 120. Inthis instance, the joining portion 121 is formed on the outercircumference of the connection portion of the joint member.

FIGS. 4 and 5 illustrate an example that the joint member having the nutportion 13 formed by the second press-molding process is manufactured asa nut, and in this instance, the joining portion 121 is a spiral groove.

FIGS. 6 and 7 a and 7 b illustrate an example that the joint memberhaving the nut portion 131 formed by the second press-molding process ismanufactured as a bolt, and in this instance, the joint member has asmall diameter portion 14 extending from the nut portion 131 in thefirst press-molding process. In this instance, the joining portion 12formed on the metal member 1000 having the small diameter portion 14 mayselectively have a spiral groove 12 a or a spiral portion 12 b accordingto kinds of the bolt, which is the joint member.

FIG. 8 is a perspective view, in a partial section, showing a statewhere a corrugated pipe is connected using the nut and the boltillustrated in FIGS. 4 to 7 a, which are the joint members manufacturedaccording to the present invention.

As described above, when joint means including the packing 31 and thecompression ring 32 is mounted at a predetermined position by the insertmember 20, a corrugated pipe or a straight pipe can be connected andmounted with sealability. The joint means may have one of variousstructures besides the above, and the insert member 20 is manufacturedaccording to the structure of the joint means.

The joint member according to the present invention, which ismanufactured as the nut or the bolt, to the connection portion ofvarious machines includes: a metal member 10 having a retaining portion11 formed by pressing a stainless steel pipe cut into a predeterminedlength and a joining portion 12 formed on the stainless steel pipe; andan insert member 20 made of synthetic resin, the insert member 20 beingpressed to the retaining portion 11 and mounted on the innercircumference of the metal member 10 to locate joint means in a properposition.

As shown in FIG. 4, in case of the joint member used as the nut, themetal member 100, which is a stainless steel pipe, further includes anut 13 having a hexagonal appearance and being formed on the outercircumference of the metal member 100 by the pressing work. Moreover, asshown in FIG. 6, in case of the joint member used as the bolt, the metalmember 1000 is press-molded to have a small diameter portion 14extending from the nut portion 131.

As shown in FIGS. 2 to 6, the joining portion 12 may be the spiralportion formed on the outer circumference of the metal member 10, 100,1000 or the spiral groove formed on the inner circumference of the metalmember 10, 100, 1000 according to kinds of the joint member.

As described above, the joint member according to the present invention,which can calm controversy of lead hazards, can be easily manufacturedonly by the manufacturing method including the steps of manufacturingthe metal member of half-finished goods through a pressing process usingthe stainless steel pipe, finishing the metal member 10 by forming thejoining portion thereon; and pressing the insert member 20 made ofsynthetic resin into the metal member 10 to locate the joint means in aproper position.

While the present invention has been described with reference to theparticular illustrative embodiments illustrated in the attacheddrawings, it is not to be restricted by the embodiments but only by theappended claims. It is to be appreciated that those skilled in the artcan change or modify the embodiment without departing from the scope andspirit of the present invention.

What is claimed is:
 1. A method of manufacturing a joint member using apipe comprising: a press-molding process of manufacturing a metal memberof half-finished goods by pressing a stainless steel pipe, which is cutinto a predetermined length, to form a retaining portion; a screwforming process of forming a joining portion on the metal member of thehalf-finished goods; and an insert press-in process of pressing aninsert member, which is made of synthetic resin material, to theretaining portion.
 2. The manufacturing method according to claim 1,wherein the press-molding process includes a first press-molding processof molding the retaining portion; and a second press-molding process ofmolding a nut portion on the outer circumference of the pipe.
 3. Themanufacturing method according to claim 1, wherein in the first pressingprocess, a small diameter portion is extendedly formed on the nutportion.